Abstract:
MPEG-7 provides a set of tools for the definiti
on of a standard description for m
ultimedia
information. It uses XML Schema as its ow
n Description Definition Language (DDL) to
provide an ability to extend sta
ndard description to user appli
cation domains. However, due to
its lack of expressive power, XML Schema
cannot represent the implicit information of
multimedia contents and hence cannot yield derived descriptions. In order to enhance the
expressive power of multimedia annotations
—described in term of an XML document—and
to maintain the advantages of XML Schema, there appears to be a need of a new schema
language which can handle those abilities.
XML Declarative Description (XDD) is a
representation framework which can encode
any XML document and
application (e.g., XML
Schema, RDF, RDF Schema, and DAML+OIL).
It enhances XML expressive power by
employing Declarative Description (DD) theo
ry and it also provides a mechanism for
reasoning about new information from existing da
ta. Moreover, it can specify constraints and
modeling ontological axioms.
